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M. M. BARRETT 8v J. F. DALY.

OPERATING MEGEANISM EOE GAS ENGINES. No. 468,435.

(No Moden.)

Patented Nov. 1'7, 1891.

IH II Nrrnn 'TA-TES ATRNT Orricn.

MORA M. BARRETT AND JOHN F. DALY,- OF SAN FRANCISCO, CALIFORNIA,ASSIGNORS TO THE PACIFIC GAS ENGINE COMPANY, OF SAME PLACE OPERATINGM-ECHA'NISM FOR GAS-ENGINES. Y

SPECIFICATION forming part of Letters Patent No. 463,435-,dated November17, 1891. Application led April 16. 1891. Serial No. 389,255. (Noinodel.)

To aZZ whom it may concern:

Be .it known that we, MORA M. BARRETT and JOHN F. DALY, citizens of theUnited States, residin gat San Francisco, in the county 'of SanFrancisco and State of California,

have invented cert-ain new and useful Improvements in OperatingMechanism for Gas- Engines; and we do hereby declare the following to bea full, clear, and exact description of said invention, such as willenable others skilled in the art` to which it most nearly appertains tomake, use, and practicel the same.

Our invention has relation to certain new and useful improvements in theoperating mechanism for gas-engines, which consists in the arrangementof parts and details of construction, as will be hereinafter more fullyset forth in the drawings and described and pointed out in thespecification.

Our present invention relates more particularly to certain improvementsupon the mechanism for operating the exhaust-valve of gas-engines, fullyset forth and described in Letters Patent No. 430,505, granted us on the17th day of June, 1890. Practical working of machines constructed inaccordance with the aforesaid Letters Patent No. 430,505 hasdemonstrated the fact that owing to the o liability of the slide-bar orrocking lever, which operates the exhaust-valve through the `medium ofthe valve-stem, becoming clogged or stuck damage ensues by reason of oneor both parts breaking, due to the driving force exerted thereon. Suchbreakage necessitates cessation of work until repaired. 'We have furtherdiscovered that the swiveled switchpiece working in the grooved camquickly wears out, thus necessitating constant repairs.

Our invention further consists in providing a speed-regulatingattachment, whereby the unnecessary loss or expenditure of power toovercome the compressing of air contained Within the engine-cylinder isobvated, thereby creating a saving in the consumption of gas necessaryto run the machine and overcoming undue Wear upon the engine. Heretoforewith each downstroke of the piston the suction thereof caused au inflowof air into the engine-cylinder, 'which formed a cushion against thenpstroke thereof, which necessarily had to be overcome by compression.IVe have discovered that by providing a speed-regulating governor,whereby the eX- haust-valve is held open until closed automatically, ashereinafterl described, by said governor, we create the air-suctionthrough the exhaust-opening with the. downstroke of the piston anddischarge thereof upon the 6o upstroke, thereby allowing of the pistonworking in free air, so to speak, so as to overcome the consumptionV ofgas before necessary to effect the compression of air contained in thecylinder, and at the same time allowing of the engine -running for alonger time with each charge thereof.

f The object of ourinvention is to provide mechanism for operating theexhaust-valve which shall be simpler in'ts construction, 7o moreeffectual of operation, less expensive, and more lasting than anyheretofore known to us. Y

Referring to the drawings forming a part of this specification, whereinsimilar letters of reference are used to denote corresponding partsthroughout the entire specification, Figure l is a front view inelevation of a gasengine; Fig. 2, a side View in elevation showing ourimproved operating mechanism ap- 8o plied thereto; Fig. 3, a horizontalsection on a plane above the crank-shaft; Fig. 4, detail front view ofthe operating mechanism, and Fig. 5 an end view thereof.

The letter A indicates the frame of the gasengine, and B the cylinderthereof, which, being of the ordinary kind, calls for no specificdescription herein. lVorking in bearings formed in frame A is thecrank-shaft C, whichis operated by the engine-piston. (Not 9o shown.)The valve-stem is indicated by the letter E, which is adapted to tooperate the exhaust-valve in order to allow of the enginecylinderclearing itself of spent gas. The spring E serves to hold the valve uponits seat, similar to that shown in Patent No. 430,505. Projecting fromthe frame A are lugs or ears f, between which upright F is movablysecured, so as to allow for oscillation thereof. Secured upon andworking roo with the crank-shaft C is the cam F', which is provided'with intersecting grooves f fr Vithin said grooves fits and works theswitchpiece g, which is secured to downwardly-extending arm g of uprightF, and as said switch-piece moves from one groove to the other said armis thrown in or out by reason of the upright being pivoted between earsf. Pivoted near the top of said upright, so as to allow for upward ordownward movement, is the forwardly-extending arm H, the outer end ofwhich is provided with the downwardly-extending toe h, which rests overcam F. Upon the outer face of said cam we secure in any suitable mannerthe shoe h', which contacts with toe h during the rotation of the cam,as arm I-I is thrown outward by the movement of upright F. When shoe his carried around and contacts with toe 7L, the arm H is lifted upward,and inasmuch as valve-stem E rests thereon the latter is raised upward,so as to unseat the exhaust-valve and allow for the escape of the spentgas contained within the engine-cylinder. 1f so desired, the shoe may beformed integral with the cam, but by preference we make the sameremovable, inasmuch as incase of much wear thereon the same may bequickly removed and another put in piace thereof with very little delaybeing caused in the working of the engine. y

Upon the outer portion of shaft C is loosely secured the sleeve G, whichis provided with grooves g3 g4, and upon the outer end is rigidlysecured the collar G. Pivotally secured .to valve-stem guide g*2 is thestem i, to which is attached the spring-plate i', the end of" which isadapted to work in the `groove g3 of sleeve G. "Within groove g4 fit thepivoted arms 7c of governor K, the balls of which are connected by meansof spring 7s. As the speed of the engine increases, the governorballsare'thrown outward and causes the out movement of sleeve G, and as thevalve-stem is lifted through the before-described mechanisln the upperend of governor-stem t' is thrown inward by pressure of spring i untilit rests under collar 71:2, fastened to the valvestem, and thus servesto support the valvestem and maintain the exhaust-valve open until thespeed of the engine has reducethor worked down sufficient to cause thepressure ot' spring 71: to close or draw together the governor-balls,thereby moving the sleeve G back upon the shaft C and forcing the springi to force the governor-stem t' from beneath collar 7a2, so as to allowthe valve-stem to fall and seat the exhaust-valve. While theexhaustvalve is held open the enginedraws in and discharges air throughthe exhaust-opening, thus allowing the pistou to work in free air,inasmuch as upon its upstroke the indrawn air is discharged through theexhaust-opening. I-Ieretofore the exhaust-valve has closed immediatelyupon the discharge of spent gas. Consequently as the piston moveddownward air was drawn into the cylinder through the air-passage andwith its upstroke said air had to be compressed, thereby creatingunnecessary wearnpon the machine and expenditure of gas. This wecompletely overcome by the present device.

We are aware that minor changes may bc made in the arrangement of partsand details of construction without causing or necessitating a departurefrom the nature and scope of our invention.

Having thus described our invention, what we claim as new, and desire tosecure protection in by Letters Patent of the United States,

1. The combination, with the operating-cam provided with intersectinggrooves, swiveled upright,arm projecting down wardly from said upright,switch-piece secured to said arm and working in the intersectinggrooves, and pivoted arm extending forward from the upright, said armadapted to be uplifted during the rotation of the cam, so as to unseatthe valve through the medium of the valve-stem, substantially as and forthe purpose set forth.

2. The con1bination,\vith the operating-cam provided with intersectinggrooves, of the swiveled upright connected to the engineframe, andswitch-piece working in the intersectin g grooves and adapted to throwthe valvelifting mechanism in or out of contact with the rotatingcam,substantially as and for the purpose set forth.

In testimony whereof we aiix our signatures in presence of twowitnesses.

MORA M. BARRETT. JOHN F. DALY. Witnesses:

N. A. ACKER, J. W. KEYS.

